Only remove actualy failed blocks from setBlockIndexValid
Bugfix: make CCoinsViewMemPool support pruned entries in underlying cache
doc: remove any mention of SOCKS4

SOCKS4 support was removed in 0127a9b, as well as the `-socks=` option.
Fix typos in comments (missing i's).
Merge pull request #4575

ad08d0b Bugfix: make CCoinsViewMemPool support pruned entries in underlying cache (Pieter Wuille)
Merge pull request #4496

5734d4d Only remove actualy failed blocks from setBlockIndexValid (Pieter Wuille)
Add comment about never updating nTimeOffset past 199 samples

Refer to issue #4521 for details.
[Qt] Code-movement-only: Format confirmation message in sendcoinsdialog
Subtract fee from amount